Pipe-covering.



C. B. LONGLEY.

PIPE COVERING.

APPLICATION man Nov. 22. 191s.

Patented Dec. 25, 1917.

xvii:

affermati@ UNITED sTATEs PATENT oEEicE.

' PIPE-COVERING.

To all whom it may concern: y

`Be it known that I, CLIFFORD B.` LoNGLEY, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented or discovered certain new and usefullmprovements in Pipe-Coverings, of which, the yfollowing is a specification, referencebeing had therein to the `accompanying drawings.v

This invention relates to heat insulating coverings Vor jackets forsteam and other pipes, and has for its general object the provisionof a covering of this character of maximum insulating eificiency` which -may be manufactured at a minimum labor c ost.

The foregoing and other objects of the invention, together ywithineans whereby the same may be carried into eect, will best be understood from the following description of one form or embodiment thereofillustrated in the 'accompanying drawing.. It will be understood,however, that the particular .constructiondescribed and shownhas been chosen for illustrative purposes merely, and that the invention, kas deined by the claims hereunto appended, may be otherwise practised with'outdeparting from the spirit and scope thereof. i

In said drawing Figure 1 is an elevation, partly b roken'- away, and

Fig. 2 is a section on the line 2--2, Fig. 1.

Referring to the drawings, 10 denotes a steam or other pipe inclosed by a jacket or covering comprising a plurality of tubes 11, 12, 13 and 1l between which are interposed spacing strips 15. Each of the tubes 11, 12, 13 and 14 consists of one or more strips of insulating material, preferably sheet asbestos, spirally wound with the adjacent edges of the spirals of each strip abutted, so as to constitute a continuous or unbroken tube. As herein shown the intermediate tubes 12 and 13 are composed of a single strip each, while the innermost and outermost tubes 11 and 14, adjacent the pipe 10 and at the exterior of the jacket, respectively, are each composed of two strips a and b, wound one over the other in such a manner that the abutting edges of one strip are oiiset with respect to those of the other. Preferably the arrangement is such that the abutting edges of one strip occupy a position about midway of the width of the other strip. This arrangement of the strips a and will break or offset the joints between the .Speccation of Letterslatentf .Patented :063,255 41917.., I applicati@ varea November 22, 191e. .fsferizal No. `132,856. l

twoA strips forming the said innermost outermost tubes 11 and 14 so as toaii'ord the t greatest ypossible strength to these double-strip tubes. The spacing strips 15 are .also composed of insulatingmaterial,preferablywool or; Y

asbestos felt, and are alsoy spirallywound. As herein shown a plurality of spacing' strips 15 are interposed between'ezachy pair or' adjacent tubes, the spirals ofthe several strips lbeing separated orspacedfrom one another `so as. to form dead air'spaces 16be-1A ...have beelitbus appliedrthecompleted jacket Akmayybe split longitudinally and removed from the mandrel, and thereafter placed in position about the pipe to be jacketed and inclosed by a covering of canvas in the usual manner.

The angle at which the strips constituting the tubes 11, 12, 13 and 1-1 are wound is determined by the width of the strips and the diameter of the mandrel, said angle and width being in such relation to one another and to said mandrel as to cause the edges of said strip to abut, as above described. The spacing strips 15 are, of course, narrower than the strips last mentioned, are preferably arranged parallel to each other in the same layer, being wound at the same angle as the abutted strips, and are of a number determined by the desired distance between them, their own Width, and the width of the f abutted strips.

It will be seen that the dead air spaces 16 coperate with the tubes and spacing strips, both of which are composed of insulating material, to increase the insulating effect of said tubes and strips, thereby greatly adding to the efficiency of the covering as a whole. It will also be seen that,

the parts of the covering, said covering may Y be manufactured at a'labor costslightly if any greater than that of making the, ordi: nary cardboard tube, thereby materially decreasing the-cost of the complete article, itv

being well known that in the processes here-r tofore employed for making pipe insulations the labor involved constitutes `about halfthe entire cost ofmanufacture. `Furthermore the spiral method of construction gives greater structural strength than is found in the form of pipe insulation now commonly employed.

Having thusdescribed my invention i claim and desire to secure by Letters Patent:

l.r An insulating pipe covering comprising av plurality oitl tubes each consisting'ot spirally wound stripsrof material with the edges of the'spirals abutted, and a plurality ofparallel, spirally wound spacing strips interposed between said tubes, the spirals of said spacing strips being separated from each other so as to form dead air spaces betweensaidtubes.

2. An insulating pipe covering comprising a vplurality ot tubes consisting ot' spirallywound strips of asbestos with the edges of the spirals abuttethand a plurality ol parallel, spirally wound felt. spacing strips interposed between said tubes, the spirals of said spacing strips being separated from eachother so as to `form dead air spaces between said tubes. y 3. An insulating pipe covering comprising a plurality ofv tubes composed of spirally CopiesV of this patent niay be obtained for wound strips ofV insulating material, the strips being of such Width that when wound at a definite angle the edges of the spiral strips will be abutted, and a plurality of spirally wound and relatively narrow, parallel spacing strips interposed between said tubes, the innermost and outermost of said tubes each'H comprising two spirally wound ,strips with abuttededges and one super-V posed on the other, with the joints of one strip oiiset with reference to the joints of theother. Y

4. The herein described method of forming insulating pipe jackets which consists in spirally winding upon a'suitable mandrel a plurality of superimposed layers, each composed of onel or more strips of'insulating material, the strips of certainv of said layers being of such width kthat when wound at a definiteV angle, which .is determinate upon the Ywidth ofthe strip and the diameter of CLIFFORD'B. LousianaV Witness l f 4 CHARLES R. ROBERTSON.

ve cents each, by addressing the "Commissioner of latenti,

Washington, D. C. Y, L Y' 

